I do think that America's weight problem is caused by our addiction to carbohydrates. But it's not the potato that is evil, it's just that too many parents don't know what a balanced diet is, and certainly their kids don't know.
All vegetables, fruits and grains contain carbs, and some are good carbs and some are not so good. The carbs in potatos, pasta, rice, have a high glycemic index that causes avery rapid rise in blood glucose (blood sugar). Normal people are able to handle this surge of sugar in the blood, but diabetics cannot. Over time, these high glycemic carbs can interfer with how our body handles fats because fats slow down the action of insulin. The results is that eating too many of these bad carbs will cause you to gain excess core-weight (weight around the torso). People are often said to have a beer belly because beer contains Maltose, which is also very high on the glycemic index. People who eat a lot of these bad carbs will often have very large bellies while they may not have much ecesses weight on their arms or legs.
Now if you eat a lot of potatos, pasta, rice, etc and add that to other sweets like sugars, sodas, or even fruit eaten during the day can carb overload your system. These intense sugar highs can to overweight, and Type-II diabetes.
The Adkins diet and South Beach diet have been fairly successful by breaking the Carb addiction. This is done by eliminating all the high glycemic carbs that rapidly raise blood glucose levels and cause your pancreas to work overtime to supply insulin. The diet requires that you not eat any of these High Glycemic foods for several weeks. Fat is less of an issue and where the two diets split. Adkins lets you eat bacon and other fatty foods, while the South Beach diet reduces your fat intake but allows you to have mono-unsaturated fats like Olive oil, etc. You cannot eat chicken or turkey with the skin on. You can eat very lean beef like Sirloin steak, etc. Of couse the also include a lot of fish and sea food.
South beach does not recommend that you drink any carbonated diet drinks, and no caffinated coffee since caffine is a stimulant that also stimulates your appetite.
I don't see any point in eliminating potatos from the school cafeteria when they serve Pizza which has bread crust which also has a high glycemic index, and then top that with the fat from the cheese and pepperoni, etc and it is probably just as bad or even worse than french fries.
...Rich